Central to remote communication system with address modification for the remote stations



April 5 1966 T. s. STAFFORD T-:TAL

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LRC P- '1- T. S. STAFFORD ETAL April 5, 1966 MODIFICATION FOR THE REMOTE STATIONS 19 Sheets-Sheet 3 Filed June 30, 1961 wmwJDa 9222:. 200425. .DaPDO Zz: 32 52: 2 D .ET- WMEP 2K l .wwhaw S 2@ o. :oos mo w3 mw wz z F S Q o o c N Si .v6-M l lll.- |I|| IT nm n- T NE T TI|| I L 1 2 0 i om ::o

T. s. STAFFORD ETAL 3,245,038

April 5, 1966 CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS 19 Sheets-Sheet 4.

Filed June 50, 1961 28.5.2 @TC d m1 om, 20322 5&3@ m .0E

April 5, 1966 T. s. STAFFORD ETAL CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS Filed June 30. 1961 19 Sheets-Sheet 5 Apl'll 5, 1966 T. s. STAFFORD ETAI.

CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADD MODIFICATION FOR THE REMOTE STATIONS Filed June 30, 1961 RESS 19 Sheets-Sheet 6 Aprll 5, 1966 T. s. STAFFORD ETAT. 3,245,038

CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS Filed June 30, 1961 19 Sheets-Sheet 7 FIG.8

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CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS Filed June 30, 1961 19 Sheets-Sheet 11 H6017 OUTPUT TIMING +S 0H TTOT T1 +S SYNC RESET TTOT +S 2K0 CK OP -S SYNC RESET +S T708 AD NCE 2 KC CK OP OUTPUT DELAY +S T6B SPECIAL IP ss +S I 2 KC CK OP +S TSB SPECIAL April 5, 1966 T. s. STAFFORD ETAL 3,245,038

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Aprll 5, 1966 T. s. STAFFORD ETAL 3,245,038

CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS Filed June 30, 1961 19 Sheets-Sheet 14 F16. 2O lNPUT CONTROL MONITOR RT 2001 TRANSMIT +S RE T0 TRANSMIT/ SEND RESET 2004 -S LINE ST Nor MoN MODE +S START SGA 2053 2 +S CLR T0 SEND S NOT SYNC 2 2028 +S YNC 1 +S SEND GA AT A +S SEND NMA 1' S T1 SPECIAL 68 b-S TS BIT 4 April 5, 1966 CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION EOE THE REMOTE STATIONS Filed June 30, 1961 T. S. STAFFORD ETAL INPUT MESSAGE ASSEMBLY -R DATA BIT C 19 Sheets-Sheet 15 FIG. 21

-S LRC BIT A +S GATE BA B4 -R DATA BIT B +S INPUT BITC -S TS DIT A -s GMI eA s4 f -S LRC BIT 8 -S NMA BIT A -R DATA BIT A +S INPUT BITB -R DATA BITB +S INPUT BIT A -S GATE GA -S LRC BIT 4 -R DATA BIT4 -S LRC BIT 2 +S INPUT BIT 8 -S MA BIT 2 -S MA BIT 4 -S NMA BIT4 -R DATA BIT 2 -S TS DIT 2 -S GATE EDM -R DATA BIT I +S INPUT Bn 2 -S SYNC 2 -S LRC BIT I -S NMA BITI -S SYNC I i l I l I ITI Aprnl 5, 1966 T. s. STAFFORD ETAL 3,245,038

CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS u MODIFICATION FOR THE REMOTE STATIONS blled June 30. 1961 19 Sheets-Sheet 16 FIG, MESSAGE FORMAT GENERATOR April 5, 1966 T. s. STAFFORD ETAL. 3,245,038

CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATIONS 19 Sheets-Sheet 17 Filed June 30, 1961 FIC-n.25

DRIVER POWER INVZEII'ER (IP) REMOTE LOAD (R) R TO S CONVERTER (C) c 5.6K 2am/@ww- B 560mm zam-@Hl-d- D 550mm 19 Sheets-Sheet 18 T. S. STAFFORD ETAL MODIFICATION FOR THE REMOTE STATIONS CENTRAL TO REMOTE COMMUNICATION SYSTEM WITH ADDRESS Omn- E D D 2 D D 2 l I /J n rea @zo H- zo s: L- 2o .E L- f E- E.- xL f E f FLJ gw?. @FJ FLJ EFT. EPT. Eve. wh* NP* wk* m. *wh* mb* NP April 5,

Filed June 30, 1961 United States Patent' O CENTRAL T REMOTE COMMUNCATION SYS- TEM WITH ADDRESS MODIFICATION FOR THE REMOTE STATINS Thomas S. Statord, Ioughkeepsie, and Francis W. Wise,

Pleasant Valley, N.Y., assgnors to International Business Machines Corporation, New York, NX., a corporation of New York `Filed .lune 30, 1961, Ser. No. 121,081

3 Claims. (Cl. 340-147) This invention relates to communications systems, and more particularly to address modification techniques for communications systems.

Telegraphic, telephonie,V and radio communications systems with remotely interconnected or controlled stations and exchanges have been used extensively for data communications, telemetering `and person to person or station to station transfer of information. Specialized addressing equipment has been designed and has performed its functions satisfactorily within the intended environment.

In the past decade, there has been a tendency to broaden the usefulness of communication systems by developing real-time data processing systems in order to meet the ever increasing demands and complexities of modern business and scientific endeavors. Systems of this nature generally have a multitude of remote terminal stations which are interconnected with a centrally located data processing system or control center.

In the real-time applications, problem factors or inquiries are entered at the remote stations, and transmitted to the data processing center for appropriate computation. Replies are generated by the data processing center and transmitted to the remote stations. A complete transaction, involving an inquiry and a reply, is usually completed in a fraction of a second.

The communication lines and equipment generally operate in millisecond time intervals, while the data processing system, being much faster, operates on the basis tof microsecond intervals. Because of this differential in time, the data processing system need not direct al-l of its activities to the intercommunication (real-time) activities. Since the data lprocessing center is usually of a general purpose nature, it lcan be used for solving other matters not related to the real-time aspects of the system. These matters may include the preparation of reports of a general business or accounting nature, statistical reports, file maintenance and other non-real time applications.

In this manner, the data processing center is capable of'handling, in their entirety, a wide range of requirements for a particular business.

Because of the dual nature of a system of this kind, it is desirable to free the data processing center from` as many of the intercommunication control functions of the system as possible.

This invention lis concerned With relieving the data processing center of a major portion of the address-ing functions normally encountered in a communications network.

In the prior art, the addressing functions of a particular system have been more or less concentrated at a control center or central exchange in order to maintain closer supervision and control of the system. Addressing of remote stations in order to notify them to transmit messages has been primarily under control of the central has been required at the central station for receipt of an answer-back signal from any addressed station, for acknowledgement purposes.

ice

station or exchange. In many instances, additional time A recent development in the `art is the, arrangement of a number of stationsl in a kpredetermined sequence with each station having facilities for addressing the next station in the sequence. The addressing sequence is initiated by the central station vand closely monitored by the central station. If any station fails to res-pond when addressed, the central station then automatically addresses the next station in the sequence so that the sequence can then icontinue as before.` In this type o-f system, the central station always intervenes when a station fails to respond. Prior art addressing techniques of this kind require that a considerab-le amount ofv the available operating time lof the center be devoted to addressing activities.

This invention is predicated on the Aconcept that any central station time saved by a reduction in addressing activities can be used to advantage in other process-ing activities.

Accordingly, an object of the invention is to provide an addressing technique vfor a multi-station communication system` which results in a greater savings in time fo-r the central station.

Another object of the invention is to provide a communications system address modication technique straightforwardV and which is free of the complexities of prior -art addressing. techniques.

A further object of the invention is to provide an addressing scheme wh-ich insures that each of a number of stations is given the opportunity to gain raccess to la common line without interference, one among the other. j Another object of the invention is to provide a communication network in which demands on the central stations time are minimized, but in which control of the network is retained in reserve by the central station.

It is another object of the invention to provide ya communication addressing scheme whichinherently and automatically continues to function, even thoughportions :of the communications network may become inoperative.

Another object of the invention is to provide a cornrnunication addressing technique which is equally effective with a few remote stations as with a great many remote stations. Another object of the invention is to provide a time multiplexing addressing technique whichrnay be effectively employed at yany information transfer level within a communication system, and which has universal application.

Still another object of the invention is to provide a communication network in which addressing is effected by digital code permutation signals.

Another object of the invention is to provide a communication system in which the addressing sequence may be altered as required with minimum intervention by the central station.

An additional object of the invention is to provide a communication system in which a change in the addressing routine may be made during one sequence under control of the central station and be effective in subsequent sequences without intervention by the central station.

In order to accomplish these and other objects, there has been provided in accordance with the present invention, a communication system which includes a number of remote stations interconnected with a central station, wherein each station has facilities for addressing a succeeding `station independently of the central station for establishing sequential access of the stations to the line, and wherein the central station can change the station to station addressing facilities of the stations to alter the 

1. A COMMUNICATION SYSTEM COMPRISING: A CENTRAL STATION AND A PLURALITY OF REMOTE STATIONS; MEANS AT EACH STATION FOR GENERATING A SELECTED ONE A PLURALITY OF ADDRESS MESSAGES, EACH UNIQUELY CORRESPONDING TO ONE OF SAID STATIONS; MEANS AT EACH STATION RESPONSIVE TO THE CORRESPONDING ONE OF SAID ADDRESS MESSAGES FOR INITIATING TRANSMISSION AT SAID STATION OF A MESSAGE GROUP INCLUDING AT LEAST AN ADDRESS MESSAGE CORRESPONDING TO ANOTHER ONE OF SAID STATIONS; MEANS AT SAID CENTRAL STATION FOR TRANSMITTING AN ADDRESS MODIFICATION MESSAGE TO SAID REMOTE STATIONS; 